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See detailContinuous odour measurement from fattening pig units
Romain, Anne-Claude ULg; Nicolas, Jacques ULg; Cobut, Pierre et al

in Atmospheric Environment (2013), 77

A study in experimental slatted-system fattening pig units was conducted with the aim of estimating the odour emission factor (in ou/s.pig), which can subsequently be used in dispersion models to assess ... [more ▼]

A study in experimental slatted-system fattening pig units was conducted with the aim of estimating the odour emission factor (in ou/s.pig), which can subsequently be used in dispersion models to assess the odour annoyance zone. Dynamic olfactometry measurements carried out at different development stages of pigs showed a logical trend of the mean predicted odour emission factor with the pig weight. However, the variation within the same weight class was much larger than variation between classes. Possible causes of such variation were identified as the evolution of ventilation rate during the day and the circadian rhythm of pig. To be able to monitor continuously the daily variation of the odour, an electronic nose was used with suitable regression model calibrated against olfactometric measurements. After appropriate validation check, the electronic nose proved to be convenient, as a complementary tool to dynamic olfactometry, to record the daily variation of the odour emission factor in the pig barn. It was demonstrated that, in the controlled conditions of the experimental pens, the daily variation of the odour emission rate could be mainly attributed to the sole influence of the circadian rhythm of pig. As a consequence, determining a representative odour emission factor in a real case cannot be based on a snapshot odour sampling. [less ▲]

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See detailContinuous reactive extrusion polymerization of L-lactide - an engineering view
Jacobsen, Sven; Fritz, Hans-Gerhard; Degée, Philippe et al

in Macromolecular Symposia (2000), 153

Polylactides (PLA), biodegradable aliphatic polyesters, produced from renewable resources might substitute petrochemically based polymers in a broad range of applications in the near future, if we manage ... [more ▼]

Polylactides (PLA), biodegradable aliphatic polyesters, produced from renewable resources might substitute petrochemically based polymers in a broad range of applications in the near future, if we manage to produce them at lower cost and higher efficiency than nowadays. Possible applications include food packaging for meat and soft drinks, films for agro-industry and non-wovens in hygienic products. The authors developed, based on a new catalytic system, a reactive extrusion polymerisation process, which can be used to produce PLA continuously in larger quantities and at lower costs than before. This extrusion polymerisation process has been developed and tested with laboratory scale machines and has to be transferred to industrial processing equipment. This paper aims to address the problems attached with this transfer and to discuss the chances to finally achieve low cost PLA at industrial scale. [less ▲]

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See detailContinuous risk assessment using serial data in patients with myocardial infarction
Albert, Adelin ULg; Chapelle, Jean-Paul ULg; Heusghem, C. et al

Poster (1983, September)

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See detailContinuous risk assessment using serial data in patients with myocardial infarction
Albert, Adelin ULg; Chapelle, Jean-Paul ULg; Heusghem, C. et al

in European Heart Journal Supplements : Journal of the European Society of Cardiology (1983), 4(Suppl. E), 61

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See detailContinuous Roll Forming Simulation using Arbitrary Lagrangian Eulerian Formalism
Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in Key Engineering Materials [=KEM] (2011), 473

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See detailContinuous Roll Forming Simulation Using Arbitrary Lagrangian Eulerian Formalism
Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in Khalili, Nasser; Valliappan, Somasundaram; Li, Qing (Eds.) et al Proceedings of the joint 9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics (2010, July)

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See detailContinuous Solar Simulator for Concentrator Photovoltaic Systems
Thibert, Tanguy ULg; Hellin, Marie-Laure ULg; Loicq, Jerôme ULg et al

in Proceedings of the 25th European Photovoltaic Solar Energy Conference (2010, September)

A continuous solar simulator for measuring performance of concentrator photovoltaic (CPV) systems is presented. The illumination system is based on a Xenon lamp, a homogenizer rod, shaping optics and a ... [more ▼]

A continuous solar simulator for measuring performance of concentrator photovoltaic (CPV) systems is presented. The illumination system is based on a Xenon lamp, a homogenizer rod, shaping optics and a 30cm diameter collimator. The design optimises the reproduction of the characteristics of direct solar illumination: 32’ divergence, high spatial homogeneity, sun-like spectral distribution, with a maximum intensity of 250W/m². It accommodates pass-band and attenuation filters to tune the beam output. It operates in continuous mode, allowing to investigate CPV thermal aspects as well. The present paper addresses the concept design of the solar simulator and associated performance results. [less ▲]

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See detailContinuous stroke volume estimation from aortic pressure using zero dimensional cardiovascular model: proof of concept study from porcine experiments.
Kamoi, Shun; Pretty, Christopher; Docherty, Paul et al

in PloS one (2014), 9(7), 102476

INTRODUCTION: Accurate, continuous, left ventricular stroke volume (SV) measurements can convey large amounts of information about patient hemodynamic status and response to therapy. However, direct ... [more ▼]

INTRODUCTION: Accurate, continuous, left ventricular stroke volume (SV) measurements can convey large amounts of information about patient hemodynamic status and response to therapy. However, direct measurements are highly invasive in clinical practice, and current procedures for estimating SV require specialized devices and significant approximation. METHOD: This study investigates the accuracy of a three element Windkessel model combined with an aortic pressure waveform to estimate SV. Aortic pressure is separated into two components capturing; 1) resistance and compliance, 2) characteristic impedance. This separation provides model-element relationships enabling SV to be estimated while requiring only one of the three element values to be known or estimated. Beat-to-beat SV estimation was performed using population-representative optimal values for each model element. This method was validated using measured SV data from porcine experiments (N = 3 female Pietrain pigs, 29-37 kg) in which both ventricular volume and aortic pressure waveforms were measured simultaneously. RESULTS: The median difference between measured SV from left ventricle (LV) output and estimated SV was 0.6 ml with a 90% range (5th-95th percentile) -12.4 ml-14.3 ml. During periods when changes in SV were induced, cross correlations in between estimated and measured SV were above R = 0.65 for all cases. CONCLUSION: The method presented demonstrates that the magnitude and trends of SV can be accurately estimated from pressure waveforms alone, without the need for identification of complex physiological metrics where strength of correlations may vary significantly from patient to patient. [less ▲]

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See detailContinuous subcutaneous insulin infusion with short-acting insulin analogues or human regular insulin: efficacy, safety, quality of life, and cost-effectiveness.
Radermecker, Régis ULg; Scheen, André ULg

in Diabetes/Metabolism Research & Reviews (2004), 20(3), 178-88

Portable insulin infusion devices are effective and safe insulin delivery systems for managing diabetes mellitus, especially type 1 diabetes. Rapidly absorbed insulin analogues, such as insulin lispro or ... [more ▼]

Portable insulin infusion devices are effective and safe insulin delivery systems for managing diabetes mellitus, especially type 1 diabetes. Rapidly absorbed insulin analogues, such as insulin lispro or insulin aspart, may offer an advantage over regular human insulin for insulin pumps. Several open-label randomised crossover trials demonstrated that continuous subcutaneous insulin infusion (CSII) with insulin lispro provided a better control of postprandial hyperglycaemia and a slightly but significantly lower glycated haemoglobin level, with lower daily insulin requirement and similar or even less hypoglycaemic episodes. A CSII study comparing insulin lispro and insulin aspart demonstrated similar results with the two analogues, and better results than those with regular insulin. Because these analogues have a quicker onset and a shorter duration of action than regular insulin, one might expect an earlier and greater metabolic deterioration in case of CSII interruption, but a more rapid correction of metabolic abnormalities after insulin boluses when reactivating the pump. These expectations were confirmed in randomised protocols comparing the metabolic changes occurring during and after CSII interruption of various durations when the pump infused either insulin lispro or regular insulin. The extra cost resulting from the use of CSII and insulin analogues in diabetes management should be compensated for by better metabolic control and quality of life. In conclusion, CSII delivering fast-acting insulin analogues may be considered as one of the best methods to replace insulin in a physiological manner by mimicking meal and basal insulin requirements, without higher risk of hypoglycaemia or ketoacidosis in well-educated diabetic patients. [less ▲]

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See detailContinuous Surface-point Distributions for 3D Object Pose Estimation and Recognition
Detry, Renaud ULg; Piater, Justus ULg

in Asian Conference on Computer Vision (2010)

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See detailContinuous synthesis of porous carbon xerogel beads.
Eskenazi, David ULg; Kreit, Patrick ULg; Compère, Philippe ULg et al

in Proceedings of the International Carbon Conference 2012 (2012, June 17)

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See detailContinuous-flow production of alkyl nitrites
Monbaliu, Jean-Christophe ULg; Jorda, Jeremy; Chevalier, Bérengère et al

in Chimica Oggi = Chemistry Today (2011), 29

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See detailContinuous-state reinforcement learning with fuzzy approximation
Busoniu, Lucian; Ernst, Damien ULg; De Schutter, Bart et al

in Tuyls, K.; Nowé, A.; Guessoum, Z. (Eds.) et al Adaptive Agents and Multi-Agent Systems III, Adaptation and Multi-Agent Learning (2008)

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. There exist several convergent and consistent RL algorithms which have been intensively studied. In their original form ... [more ▼]

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. There exist several convergent and consistent RL algorithms which have been intensively studied. In their original form, these algorithms require that the environment states and agent actions take values in a relatively small discrete set. Fuzzy representations for approximate, model-free RL have been proposed in the literature for the more difficult case where the state-action space is continuous. In this work, we propose a fuzzy approximation architecture similar to those previously used for Q-learning, but we combine it with the model-based Q-value iteration algorithm. We prove that the resulting algorithm converges. We also give a modified, asynchronous variant of the algorithm that converges at least as fast as the original version. An illustrative simulation example is provided. [less ▲]

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See detailContinuous-state reinforcement learning with fuzzy approximation
Busoniu, Lucian; Ernst, Damien ULg; Babuska, Robert et al

in Proceedings of the 7th European Symposium on Adaptive Learning Agents and Multi-Agent Systems (ALAMAS-07) (2007)

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. Well-understood RL algorithms with good convergence and consistency properties exist. In their original form, these ... [more ▼]

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. Well-understood RL algorithms with good convergence and consistency properties exist. In their original form, these algorithms require that the environment states and agent actions take values in a relatively small discrete set. Fuzzy representations for approximate, model-free RL have been proposed in the literature for the more difficult case where the state-action space is continuous. In this work, we propose a fuzzy approximation structure similar to those previously used for Q-learning, but we combine it with the model-based Q-value iteration algorithm. We show that the resulting algorithm converges. We also give a modif ed, serial variant of the algorithm that converges at least as fast as the original version. An illustrative simulation example is provided. [less ▲]

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See detailContinuous-time susbspace flows related to the symmetric eigenvalue problem
Absil, Pierre-Antoine; Sepulchre, Rodolphe ULg; Mahony, Robert

in Pacific Journal of Optimization (2008), 4(2), 179--194

The classes of continuous-time flows on Rn×p that induce the same flow on the set of p-dimensional subspaces of Rn are described. The power flow is briefly reviewed in this framework, and a subspace ... [more ▼]

The classes of continuous-time flows on Rn×p that induce the same flow on the set of p-dimensional subspaces of Rn are described. The power flow is briefly reviewed in this framework, and a subspace generalization of the Rayleigh quotient flow [Linear Algebra Appl. 368C, 2003, pp. 343–357] is proposed and analyzed. This new flow displays a property akin to deflation in finite time. [less ▲]

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See detailA Continuum Damage Mechanics based bone remodelling model in a finite strain framework
Mengoni, Marlène ULg; Ponthot, Jean-Philippe ULg

in ECCM 2010, 4th European Conference on Computational Mechanics (2010)

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See detailA Continuum Damage Mechanics Model for the Analysis of the Crashworthiness of Composite Structures: A work in progress
Chiu, Louis N S; Falzon, Brian G; Boman, Romain ULg

in Proceedings of the 15th Australian Aeronautical Conference (2013, February)

The crashworthiness capability of an aircraft structure is dependent on its ability to attenuate crash loading via the controlled deformation of energy absorbing devices. An energy-based constitutive ... [more ▼]

The crashworthiness capability of an aircraft structure is dependent on its ability to attenuate crash loading via the controlled deformation of energy absorbing devices. An energy-based constitutive relation was employed to model the behaviour of carbon fibre reinforced epoxy resin composite material under crush loading. Each of the damage modes in the fibre and matrix was treated separately with its own damage initiation and progression relationships as well as a damage parameter that tracks damage progression. Each damage parameter dictates the reduction in stiffness in the respective principal loading directions. This model was implemented for a 3D solid brick element in contrast to shell-based formulations currently available. Crushing composite structures were modelled and the results validated against experimental data. The force-displacement response / specific energy absorption and the failure modes obtained from the simulation show that the underlying physics of the crushing have been captured by the proposed model but that further work is required for reliable quantitative correlation. [less ▲]

Detailed reference viewed: 84 (8 ULg)